Add strategy to module exports (#464)

# Describe Request

This PR adds the strategies to the module exports, so you can use them
like they are mentioned in the documentation.

src/index.ts

@@ -6,3 +6,4 @@ export * from './chart/index';
 export * from './company/index';
 export * from './helper/index';
 export * from './indicator/index';
+export * from './strategy/index';